alleryIn P = I²R, what does R represent?
- P equals V plus I
- P equals V times I
- P equals I divided by V
- P equals V divided by I
Show answer and solution
Correct answer: B. P equals V times I
R represents the electrical resistance of the resistive load.
ICSE Class 10 Electricity: Current and Household Circuits — practice questions — page 2
Explore 100 free Electricity: Current and Household Circuits questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.
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In P = I²R, what does R represent?Read the answer and worked solution →One watt is equal to what?Read the answer and worked solution →Which property describes a material’s intrinsic opposition to current?Read the answer and worked solution →What does greater wire length do to resistance?Read the answer and worked solution →For the same material and length, what does a thicker wire have?Read the answer and worked solution →Which metal is a high-conductivity electrical conductor?Read the answer and worked solution →A material’s intrinsic resistance property is measured in which unit?Read the answer and worked solution →What protection does a fuse provide to a circuit?Read the answer and worked solution →What safety role does earthing serve?Read the answer and worked solution →In a parallel circuit, what is the same across all branches?Read the answer and worked solution →In a series circuit, what is true about its paths?Read the answer and worked solution →What does a parallel circuit do to total current?Read the answer and worked solution →How is electrical power defined for a circuit?Read the answer and worked solution →How is a fuse connected so all protected current passes through it?Read the answer and worked solution →What happens to a series circuit if one component opens?Read the answer and worked solution →A 12 V supply is across a 4 Ω resistor. What current flows?Read the answer and worked solution →A 0.5 A current flows through 20 Ω. What voltage is across it?Read the answer and worked solution →Three resistors of 3 Ω, 4 Ω and 5 Ω are in series. Find total resistance.Read the answer and worked solution →Two resistors, 6 Ω and 3 Ω, are in parallel. What is their equivalent resistance?Read the answer and worked solution →What current flows through a 2 Ω resistor on a 12 V supply?Read the answer and worked solution →A device draws 3 A at 24 V. What electric power does it use?Read the answer and worked solution →How many megajoules are equal to one kilowatt-hour?Read the answer and worked solution →A 4 Ω resistor carries 3 A. Find its power using P = I²R.Read the answer and worked solution →In a circuit, what does an electric heater do with consumed power?Read the answer and worked solution →With material and area fixed, doubling wire length makes R…Read the answer and worked solution →For unchanged material and length, how does twice the area affect R?Read the answer and worked solution →Two 5 Ω resistors are connected in series to a 2 A current. What voltage is across the pair?Read the answer and worked solution →A 6 Ω and a 3 Ω resistor are each connected across 12 V in parallel. What total current flows?Read the answer and worked solution →For two parallel resistors, equivalent resistance is…Read the answer and worked solution →What voltage is across a 10 Ω resistor carrying 3 A?Read the answer and worked solution →
Worked practice questions
One watt is equal to what?
- One volt per second
- One joule per second
- One joule per coulomb
- One ampere per volt
Show answer and solution
Correct answer: B. One joule per second
A watt is one joule of energy transferred per second.
Which property describes a material’s intrinsic opposition to current?
- Charge
- Voltage
- Power
- Resistivity
Show answer and solution
Correct answer: D. Resistivity
Resistivity is an intrinsic property measuring how strongly a material resists current.
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